I used GC-MS and LC-MS to find impurities in o-phenylenediamine
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In 2005, due to project needs, I found the following impurities in o-phenylenediamine through gas and liquid mass spectrometry. I hope it will be helpful to relevant production units and technical personnel of units that use o-phenylenediamine. 1. Benzofurazan CAS: 273-09-6 Benzofurazan C6H4N2O melting point 53-55 degrees 2. p-Chloroaniline 3. 2, 1, 3-Benzothiadiazole CAS:273-13-2 2,1,3-benzothiadiazole C6H4N2S melting point 44 degrees 4, o* * * Amine 5, 1H Indazole 6, 1H Benzimidazole 7, Aniline 8, Benzenamine
Among them, impurities No. 1 and No. 3 are most closely related to the process. One is the influence of sulfur, and the other is oxidation. The solution to the process problem is to appropriately reduce the temperature and pressure of reduction to prevent the oxidation of o-phenylenediamine.
The original poster is awesome, can you share your article?
The instrument helps. I just use it to do something for myself. If friends need it, I will provide the mass spectrum. As long as it is useful to you and does not violate corporate secrets, I want to share a seed and enjoy it.